I've always been bad at doing hand calculations (probably my adhd); In my first course of calculus I asked my professor if he would still give me points on prob

I've always been bad at doing hand calculations (probably my adhd); In my first course of calculus I asked my professor if he would still give me points on problems where the final answers didn't match because of calculations errors but the overall reasoning was sound. He said "well... ok, standards have gone down over the years", then he looked in the amphitheater where he had a section of chairs that had missing desks and finally said: " though I really shouldn't, because you're all engineers, and just look what engineers that make "small" errors in calculations" accomplish". Probably I could not have become an engineer 100 years ago.